| Summary: | 碩士 === 元智工學院 === 化學工程學系 === 85 === In this study, a built-in-lab was modified flow-type adsorption
system for multicomponent adsorption experiment such
that the adsorption behaviors near industrial reaction
conditions could be examined. Similar results obtained by the
TCD and the Mass spectrometry detection for one-component
adsorption experiments confirm the capability of the
system. and the accuracy of uptake measured with this system
was found better than 0.04 mmole. Besides, both the step and the
integral experimental procedures showed very similar
results, with the latter capable of resolving
irreversible and reversible uptakes.
Hydrogen and Cyclohexane would not adsorption on TiO2, as
observed in one- component adsorption experiment,
Benzene and Toluene both reversibly adsorption on TiO2
with the latter showing higher uptake at similar partial
pressure condition. The pressure of Cyclohexane showed no
effect on the Benzene adsorption isotherm on TiO2;
However, the pressure of 500 torr H2 reduced Benzene uptake @
lower Benzene partial pressure but not at higher
partial pressure; thus, the Benzene isothermwas changed from
type IV to Type V. In the competitive adsorption between Benzene
and Toluene over TiO2 the Benzene adsorption isotherm was not
changed significantly but the Toluene isotherm
was shifted to lower uptake values. Although the estimated
adsorption constant for both Benzene and Toluene were lower that
measured in the one-component experiment. The relative ratio of
their adsorption constant was not changed.
Benzene and Toluene adsorption over Pt powders were mostly
irreversible; the Toluene showed higher uptake than
Benzene under similar partial pressure condition. However,
the estimated monolayer coverages showed that the average cross
sectional area were much smaller than the van der Waal cross
sectional area of the ring; therefor, the adsorption of
Benzene or Toluene on Pt powder may not be flat lying.
Besides, dehydrogenation occurred concurrently which Benzene and
Toluene adsorption on Pt powder; the estimated
evolved Hydrogen show nearly 0.004 molar ratio to the
Benzene or Toluene uptake. In the competitive adsorption between
Benzene and Toluene, the Toluene isotherm was not affected by
the presence of Benzene but the Benzene isotherm was
changed.
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